1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 4 * Copyright (c) 2013 Red Hat, Inc. 5 * All Rights Reserved. 6 */ 7 #include "xfs.h" 8 #include "xfs_fs.h" 9 #include "xfs_shared.h" 10 #include "xfs_format.h" 11 #include "xfs_log_format.h" 12 #include "xfs_trans_resv.h" 13 #include "xfs_bit.h" 14 #include "xfs_mount.h" 15 #include "xfs_da_format.h" 16 #include "xfs_da_btree.h" 17 #include "xfs_inode.h" 18 #include "xfs_attr.h" 19 #include "xfs_attr_remote.h" 20 #include "xfs_trans.h" 21 #include "xfs_bmap.h" 22 #include "xfs_attr_leaf.h" 23 #include "xfs_quota.h" 24 #include "xfs_dir2.h" 25 #include "xfs_error.h" 26 27 /* 28 * Invalidate any incore buffers associated with this remote attribute value 29 * extent. We never log remote attribute value buffers, which means that they 30 * won't be attached to a transaction and are therefore safe to mark stale. 31 * The actual bunmapi will be taken care of later. 32 */ 33 STATIC int 34 xfs_attr3_rmt_stale( 35 struct xfs_inode *dp, 36 xfs_dablk_t blkno, 37 int blkcnt) 38 { 39 struct xfs_bmbt_irec map; 40 int nmap; 41 int error; 42 43 /* 44 * Roll through the "value", invalidating the attribute value's 45 * blocks. 46 */ 47 while (blkcnt > 0) { 48 /* 49 * Try to remember where we decided to put the value. 50 */ 51 nmap = 1; 52 error = xfs_bmapi_read(dp, (xfs_fileoff_t)blkno, blkcnt, 53 &map, &nmap, XFS_BMAPI_ATTRFORK); 54 if (error) 55 return error; 56 if (XFS_IS_CORRUPT(dp->i_mount, nmap != 1)) 57 return -EFSCORRUPTED; 58 59 /* 60 * Mark any incore buffers for the remote value as stale. We 61 * never log remote attr value buffers, so the buffer should be 62 * easy to kill. 63 */ 64 error = xfs_attr_rmtval_stale(dp, &map, 0); 65 if (error) 66 return error; 67 68 blkno += map.br_blockcount; 69 blkcnt -= map.br_blockcount; 70 } 71 72 return 0; 73 } 74 75 /* 76 * Invalidate all of the "remote" value regions pointed to by a particular 77 * leaf block. 78 * Note that we must release the lock on the buffer so that we are not 79 * caught holding something that the logging code wants to flush to disk. 80 */ 81 STATIC int 82 xfs_attr3_leaf_inactive( 83 struct xfs_trans **trans, 84 struct xfs_inode *dp, 85 struct xfs_buf *bp) 86 { 87 struct xfs_attr3_icleaf_hdr ichdr; 88 struct xfs_mount *mp = bp->b_mount; 89 struct xfs_attr_leafblock *leaf = bp->b_addr; 90 struct xfs_attr_leaf_entry *entry; 91 struct xfs_attr_leaf_name_remote *name_rmt; 92 int error = 0; 93 int i; 94 95 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf); 96 97 /* 98 * Find the remote value extents for this leaf and invalidate their 99 * incore buffers. 100 */ 101 entry = xfs_attr3_leaf_entryp(leaf); 102 for (i = 0; i < ichdr.count; entry++, i++) { 103 int blkcnt; 104 105 if (!entry->nameidx || (entry->flags & XFS_ATTR_LOCAL)) 106 continue; 107 108 name_rmt = xfs_attr3_leaf_name_remote(leaf, i); 109 if (!name_rmt->valueblk) 110 continue; 111 112 blkcnt = xfs_attr3_rmt_blocks(dp->i_mount, 113 be32_to_cpu(name_rmt->valuelen)); 114 error = xfs_attr3_rmt_stale(dp, 115 be32_to_cpu(name_rmt->valueblk), blkcnt); 116 if (error) 117 goto err; 118 } 119 120 xfs_trans_brelse(*trans, bp); 121 err: 122 return error; 123 } 124 125 /* 126 * Recurse (gasp!) through the attribute nodes until we find leaves. 127 * We're doing a depth-first traversal in order to invalidate everything. 128 */ 129 STATIC int 130 xfs_attr3_node_inactive( 131 struct xfs_trans **trans, 132 struct xfs_inode *dp, 133 struct xfs_buf *bp, 134 int level) 135 { 136 struct xfs_mount *mp = dp->i_mount; 137 struct xfs_da_blkinfo *info; 138 xfs_dablk_t child_fsb; 139 xfs_daddr_t parent_blkno, child_blkno; 140 struct xfs_buf *child_bp; 141 struct xfs_da3_icnode_hdr ichdr; 142 int error, i; 143 144 /* 145 * Since this code is recursive (gasp!) we must protect ourselves. 146 */ 147 if (level > XFS_DA_NODE_MAXDEPTH) { 148 xfs_buf_mark_corrupt(bp); 149 xfs_trans_brelse(*trans, bp); /* no locks for later trans */ 150 return -EFSCORRUPTED; 151 } 152 153 xfs_da3_node_hdr_from_disk(dp->i_mount, &ichdr, bp->b_addr); 154 parent_blkno = xfs_buf_daddr(bp); 155 if (!ichdr.count) { 156 xfs_trans_brelse(*trans, bp); 157 return 0; 158 } 159 child_fsb = be32_to_cpu(ichdr.btree[0].before); 160 xfs_trans_brelse(*trans, bp); /* no locks for later trans */ 161 162 /* 163 * If this is the node level just above the leaves, simply loop 164 * over the leaves removing all of them. If this is higher up 165 * in the tree, recurse downward. 166 */ 167 for (i = 0; i < ichdr.count; i++) { 168 /* 169 * Read the subsidiary block to see what we have to work with. 170 * Don't do this in a transaction. This is a depth-first 171 * traversal of the tree so we may deal with many blocks 172 * before we come back to this one. 173 */ 174 error = xfs_da3_node_read(*trans, dp, child_fsb, &child_bp, 175 XFS_ATTR_FORK); 176 if (error) 177 return error; 178 179 /* save for re-read later */ 180 child_blkno = xfs_buf_daddr(child_bp); 181 182 /* 183 * Invalidate the subtree, however we have to. 184 */ 185 info = child_bp->b_addr; 186 switch (info->magic) { 187 case cpu_to_be16(XFS_DA_NODE_MAGIC): 188 case cpu_to_be16(XFS_DA3_NODE_MAGIC): 189 error = xfs_attr3_node_inactive(trans, dp, child_bp, 190 level + 1); 191 break; 192 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC): 193 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC): 194 error = xfs_attr3_leaf_inactive(trans, dp, child_bp); 195 break; 196 default: 197 xfs_buf_mark_corrupt(child_bp); 198 xfs_trans_brelse(*trans, child_bp); 199 error = -EFSCORRUPTED; 200 break; 201 } 202 if (error) 203 return error; 204 205 /* 206 * Remove the subsidiary block from the cache and from the log. 207 */ 208 error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, 209 child_blkno, 210 XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, 211 &child_bp); 212 if (error) 213 return error; 214 error = bp->b_error; 215 if (error) { 216 xfs_trans_brelse(*trans, child_bp); 217 return error; 218 } 219 xfs_trans_binval(*trans, child_bp); 220 221 /* 222 * If we're not done, re-read the parent to get the next 223 * child block number. 224 */ 225 if (i + 1 < ichdr.count) { 226 struct xfs_da3_icnode_hdr phdr; 227 228 error = xfs_da3_node_read_mapped(*trans, dp, 229 parent_blkno, &bp, XFS_ATTR_FORK); 230 if (error) 231 return error; 232 xfs_da3_node_hdr_from_disk(dp->i_mount, &phdr, 233 bp->b_addr); 234 child_fsb = be32_to_cpu(phdr.btree[i + 1].before); 235 xfs_trans_brelse(*trans, bp); 236 } 237 /* 238 * Atomically commit the whole invalidate stuff. 239 */ 240 error = xfs_trans_roll_inode(trans, dp); 241 if (error) 242 return error; 243 } 244 245 return 0; 246 } 247 248 /* 249 * Indiscriminately delete the entire attribute fork 250 * 251 * Recurse (gasp!) through the attribute nodes until we find leaves. 252 * We're doing a depth-first traversal in order to invalidate everything. 253 */ 254 static int 255 xfs_attr3_root_inactive( 256 struct xfs_trans **trans, 257 struct xfs_inode *dp) 258 { 259 struct xfs_mount *mp = dp->i_mount; 260 struct xfs_da_blkinfo *info; 261 struct xfs_buf *bp; 262 xfs_daddr_t blkno; 263 int error; 264 265 /* 266 * Read block 0 to see what we have to work with. 267 * We only get here if we have extents, since we remove 268 * the extents in reverse order the extent containing 269 * block 0 must still be there. 270 */ 271 error = xfs_da3_node_read(*trans, dp, 0, &bp, XFS_ATTR_FORK); 272 if (error) 273 return error; 274 blkno = xfs_buf_daddr(bp); 275 276 /* 277 * Invalidate the tree, even if the "tree" is only a single leaf block. 278 * This is a depth-first traversal! 279 */ 280 info = bp->b_addr; 281 switch (info->magic) { 282 case cpu_to_be16(XFS_DA_NODE_MAGIC): 283 case cpu_to_be16(XFS_DA3_NODE_MAGIC): 284 error = xfs_attr3_node_inactive(trans, dp, bp, 1); 285 break; 286 case cpu_to_be16(XFS_ATTR_LEAF_MAGIC): 287 case cpu_to_be16(XFS_ATTR3_LEAF_MAGIC): 288 error = xfs_attr3_leaf_inactive(trans, dp, bp); 289 break; 290 default: 291 error = -EFSCORRUPTED; 292 xfs_buf_mark_corrupt(bp); 293 xfs_trans_brelse(*trans, bp); 294 break; 295 } 296 if (error) 297 return error; 298 299 /* 300 * Invalidate the incore copy of the root block. 301 */ 302 error = xfs_trans_get_buf(*trans, mp->m_ddev_targp, blkno, 303 XFS_FSB_TO_BB(mp, mp->m_attr_geo->fsbcount), 0, &bp); 304 if (error) 305 return error; 306 error = bp->b_error; 307 if (error) { 308 xfs_trans_brelse(*trans, bp); 309 return error; 310 } 311 xfs_trans_binval(*trans, bp); /* remove from cache */ 312 /* 313 * Commit the invalidate and start the next transaction. 314 */ 315 error = xfs_trans_roll_inode(trans, dp); 316 317 return error; 318 } 319 320 /* 321 * xfs_attr_inactive kills all traces of an attribute fork on an inode. It 322 * removes both the on-disk and in-memory inode fork. Note that this also has to 323 * handle the condition of inodes without attributes but with an attribute fork 324 * configured, so we can't use xfs_inode_hasattr() here. 325 * 326 * The in-memory attribute fork is removed even on error. 327 */ 328 int 329 xfs_attr_inactive( 330 struct xfs_inode *dp) 331 { 332 struct xfs_trans *trans; 333 struct xfs_mount *mp; 334 int lock_mode = XFS_ILOCK_SHARED; 335 int error = 0; 336 337 mp = dp->i_mount; 338 ASSERT(! XFS_NOT_DQATTACHED(mp, dp)); 339 340 xfs_ilock(dp, lock_mode); 341 if (!XFS_IFORK_Q(dp)) 342 goto out_destroy_fork; 343 xfs_iunlock(dp, lock_mode); 344 345 lock_mode = 0; 346 347 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_attrinval, 0, 0, 0, &trans); 348 if (error) 349 goto out_destroy_fork; 350 351 lock_mode = XFS_ILOCK_EXCL; 352 xfs_ilock(dp, lock_mode); 353 354 if (!XFS_IFORK_Q(dp)) 355 goto out_cancel; 356 357 /* 358 * No need to make quota reservations here. We expect to release some 359 * blocks, not allocate, in the common case. 360 */ 361 xfs_trans_ijoin(trans, dp, 0); 362 363 /* 364 * Invalidate and truncate the attribute fork extents. Make sure the 365 * fork actually has attributes as otherwise the invalidation has no 366 * blocks to read and returns an error. In this case, just do the fork 367 * removal below. 368 */ 369 if (xfs_inode_hasattr(dp) && 370 dp->i_afp->if_format != XFS_DINODE_FMT_LOCAL) { 371 error = xfs_attr3_root_inactive(&trans, dp); 372 if (error) 373 goto out_cancel; 374 375 error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0); 376 if (error) 377 goto out_cancel; 378 } 379 380 /* Reset the attribute fork - this also destroys the in-core fork */ 381 xfs_attr_fork_remove(dp, trans); 382 383 error = xfs_trans_commit(trans); 384 xfs_iunlock(dp, lock_mode); 385 return error; 386 387 out_cancel: 388 xfs_trans_cancel(trans); 389 out_destroy_fork: 390 /* kill the in-core attr fork before we drop the inode lock */ 391 if (dp->i_afp) { 392 xfs_idestroy_fork(dp->i_afp); 393 kmem_cache_free(xfs_ifork_cache, dp->i_afp); 394 dp->i_afp = NULL; 395 } 396 if (lock_mode) 397 xfs_iunlock(dp, lock_mode); 398 return error; 399 } 400